Sometimes, an idea seems so great in your own head that you fail to ask a simple question.
What could possibly go wrong?*
While personally injurious, psychologically, physically or cosmically, this complete lack of follow through leads to some amusing stories. The Darwin Awards are predicated on people not asking this simple question, with fatal consequences.
We don't have to go that far. Your starter for ten is a prize winning fancy dress contestant.
A prankster sparked outrage after winning a prize at a fancy dress competition as paedophile Rolf Harris - while holding a sign which read: 'I touch kids'.
Oliver Denton, 29, dressed up as the former Animal Hospital presenter, 87, and was wearing a waistcoat, a goatee beard and a pair of glasses.
He was stood next a white piece of paper - placed on an easel - which also included the statement: 'I love Jimmy Savile' and was signed by 'R Harris'.
* I know what can go wrong here. The thread can die unloved, without reply